meson: use phosphor-logging for debug statements

There is no need to individually patch each file to enable debug
logging.

All the different definitions of 'bool debug' are removed in favor of
using phosphor-logging.

Change-Id: Ia9a8ecfa4ea220f588d7cf2d291b14067e0391e7
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/subprojects/sdbusplus.wrap b/subprojects/sdbusplus.wrap
index d470130..7b076d0 100644
--- a/subprojects/sdbusplus.wrap
+++ b/subprojects/sdbusplus.wrap
@@ -1,3 +1,6 @@
 [wrap-git]
 url = https://github.com/openbmc/sdbusplus.git
 revision = HEAD
+
+[provide]
+sdbusplus = sdbusplus_dep